introduction to database tonga institute of higher education nos 215
TRANSCRIPT
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Introduction to Database
Tonga Institute of Higher EducationNOS 215
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Topics
Database Database Management System
(DBMS) Advantage of a Database
management systems
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Database
A Database is a collection of related data that has been organized to allow easy access. Eg
Telephone book
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Database
In computing, a file system is a method for storing and organizing computer files and the data they contain to make it easy to find and access them
In a flat file system, everything is stored at the same level on the media
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What is meant by Database Management Systems (DBMS)
A DBMS is a computer software package which provide the user with a set of powerful tools for Storing Retrieving, Editing Sorting Presenting Manipulating
data easily and quickly as required
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Database Management Systems
DBMS enables the user to: Create a Database Add, edit and remove data from
database View and modify the database Create reports Derive a specific output such as
displaying only certain criteria
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DBMS Applications
Maintain general records - such as name and contact.
Stock Maintenance – include retail items in store.
Cataloguing items such as books in a Library
Preparing mailing List And so on
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RDBMS
Proposed by Ted Codd 1970 Any data can be stored in a form of
a table called Relation. Later companies base on Codd’s
proposal, develop what we now called Relational Database.
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Relational Database management Systems (RDBMS)
Most powerful DBMS use what is called a “relational” database structure.
“Relational” means that relationships can be found and created between different sets of data.
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Example
You might have a set of data about students and one about classes.
If the class table saved who was in the class, you could look up and see where that student lived, using the student table. This is a relationship
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Relational Database management Systems (RDBMS)
Stores Data in many related tables It allows you to ask questions
utilizing data from one or more table
Receive answers as queries, forms and report.
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DBMS Packages
Access (Windows) Approach (Windows) dBASE III PLUS and dBASE IV Foxpro Paradox Quest
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Task
Not count for final assessment but for your own good
Find other database packages.
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Database Terminology
Data management software (databases) help organize, sort, store, and update data.
A “record” holds the data for a single entity. If we had a database for students, a single
“record” would save all the information about one student
A “field” holds one item of data called attributes. The students name would be a field. So would his
age, or address
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Database Term
Each information on a Card eg address is called a field
Each Card is called a record
All Cards make up the Customer File
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View in a Table format
Customer F/Name Address Suburb Postcode Phone
Anderson Julie 14 Pool Street
Research 3149 437 8408
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Advantage of DBMS
In terms of storing – All the old records can be replaced by one computer
In term of searching – easily speedily and efficiently search.
And others
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Summary
Database Database Management System Advantages